Malicious PDF — malware analysis report

Static analysis result for SHA-256 2883e0c34f5ad818…

MALICIOUS

PDF

78.7 KB Created: 2021-10-20 23:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 467f009e80cf41b705c788aba9e33d74 SHA-1: f63dc14270fd23d2ac34d3ab315c89e3ae19a51d SHA-256: 2883e0c34f5ad818f9b8cdad651c69f5087d16133a8d3395605b13ae9141ef85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.petercar0937494634.com/upload/img/files/15940988981.pdf In PDF document text
    • http://vinhhangvien.com/upload/files/guvuropinomumawaxoj.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/pifukabinofevozeju.pdfIn PDF document text
    • http://boxethai38.com/upload/file/fulokub.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/4001523759.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/86739655520.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/7463464757.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/45969672855.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/bivofowasor.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/bidawiwovaw.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/duzikopuxubalepefos.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8708e83ef---31139843473.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/rekanowapenobufituwudek.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161532d16a6730---41160027726.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/nevasozumomuxodekemerunar.pdfIn PDF document text
    • http://thekkadyinfo.com/userfiles/file/35542771899.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/51767277786.pdfIn PDF document text
    • https://sabresources.com/FCKuploads/file/30038661632.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/rapujumijosumoxe.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/31832849648.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/xewubudetapib.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/91171147669.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/babekesixavefe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=subtracting+rational+expressionsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51E 10968 bytes
SHA-256: ebb484e1d03edf3f02e8960539223ffeae7a04191547188351c0ac867c8df585
font_02_sfnt_off0000fe7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 17780 bytes
SHA-256: 9127335fa12a84ac870e489d63f35c65790219e57e61d6fcbc6b4e22e22f3ddd

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